Validate aggregated messages against aisdk message format + log errors #5254

Job	Run time
build-and-check	2m 38s
test-integration-.agents	1m 21s
test-integration-packages/internal	41s
test-integration-common	41s
test-integration-sdk	1m 0s
test-.agents	48s
test-integration-packages/billing	41s
test-integration-cli	41s
test-common	47s
test-integration-web	46s
test-packages/agent-runtime	59s
test-integration-packages/agent-runtime	42s
test-cli	1m 17s
test-sdk	57s
test-packages/internal	42s
test-web	43s
test-packages/billing	39s
	16m 3s

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